https://dataandaischool.io/tags/fundamentals/Recent content in Fundamentals on Data & AI SchoolHugoen-usWed, 19 Aug 2026 00:00:00 +0000https://dataandaischool.io/ai-engineering/posts/evaluating-genai-systems/Wed, 19 Aug 2026 00:00:00 +0000https://dataandaischool.io/ai-engineering/posts/evaluating-genai-systems/GenAI systems need real evaluation — accuracy, relevance, safety — just like any other engineering system, not vibes-based judgment.https://dataandaischool.io/ai-engineering/posts/ai-agents-101/Tue, 18 Aug 2026 00:00:00 +0000https://dataandaischool.io/ai-engineering/posts/ai-agents-101/The shift from a model that answers questions to one that takes real actions using tools — the plan, act, observe, repeat loop.https://dataandaischool.io/ai-engineering/posts/hallucinations-why-and-how-to-reduce/Mon, 17 Aug 2026 00:00:00 +0000https://dataandaischool.io/ai-engineering/posts/hallucinations-why-and-how-to-reduce/The honest explanation for why LLMs make things up, and practical ways to reduce it — grounding, citations, and a few other levers.https://dataandaischool.io/data-engineering/posts/the-modern-data-stack-mapped-out/Mon, 10 Aug 2026 00:00:00 +0000https://dataandaischool.io/data-engineering/posts/the-modern-data-stack-mapped-out/Everything you've learned, in one picture: how data sources, pipelines, storage, quality, modeling, and access all work together in 2026.https://dataandaischool.io/posts/the-modern-data-stack-mapped-out/Mon, 10 Aug 2026 00:00:00 +0000https://dataandaischool.io/posts/the-modern-data-stack-mapped-out/Everything you've learned, in one picture — how data sources, pipelines, storage, quality, modeling, and access all work together in 2026.https://dataandaischool.io/data-engineering/posts/data-quality-what-can-actually-go-wrong/Sun, 09 Aug 2026 00:00:00 +0000https://dataandaischool.io/data-engineering/posts/data-quality-what-can-actually-go-wrong/The silent failures that break dashboards and reports: why garbage data means garbage insights, and how to catch problems before they cascade.https://dataandaischool.io/posts/data-quality-what-can-actually-go-wrong/Sun, 09 Aug 2026 00:00:00 +0000https://dataandaischool.io/posts/data-quality-what-can-actually-go-wrong/The silent failures that break dashboards and reports — why garbage data means garbage insights, and how to catch problems before they cascade.https://dataandaischool.io/data-engineering/posts/what-is-data-modeling-and-why-it-matters/Sat, 08 Aug 2026 00:00:00 +0000https://dataandaischool.io/data-engineering/posts/what-is-data-modeling-and-why-it-matters/How to organize your data like a blueprint: designing warehouse structures so queries are fast, accurate, and make sense.https://dataandaischool.io/posts/what-is-data-modeling-and-why-it-matters/Sat, 08 Aug 2026 00:00:00 +0000https://dataandaischool.io/posts/what-is-data-modeling-and-why-it-matters/How to organize your data like a blueprint — designing warehouse structures so queries are fast, accurate, and make sense.https://dataandaischool.io/data-engineering/posts/structured-vs-semi-structured-vs-unstructured-data/Fri, 07 Aug 2026 00:00:00 +0000https://dataandaischool.io/data-engineering/posts/structured-vs-semi-structured-vs-unstructured-data/Why some data fits neatly into tables and some doesn't: why that difference shapes whether you use a warehouse or a lake.https://dataandaischool.io/posts/structured-vs-semi-structured-vs-unstructured-data/Fri, 07 Aug 2026 00:00:00 +0000https://dataandaischool.io/posts/structured-vs-semi-structured-vs-unstructured-data/Why some data fits neatly into tables and some doesn't — and why that difference shapes whether you use a warehouse or a lake.https://dataandaischool.io/data-engineering/posts/what-is-a-data-pipeline-really/Thu, 06 Aug 2026 00:00:00 +0000https://dataandaischool.io/data-engineering/posts/what-is-a-data-pipeline-really/From raw data to insights: how a data pipeline connects every step and turns chaos into clarity.https://dataandaischool.io/posts/what-is-a-data-pipeline-really/Thu, 06 Aug 2026 00:00:00 +0000https://dataandaischool.io/posts/what-is-a-data-pipeline-really/From raw data to insights — how a data pipeline connects every step and turns chaos into clarity.https://dataandaischool.io/ai-engineering/posts/embeddings-and-vector-similarity/Wed, 05 Aug 2026 00:00:00 +0000https://dataandaischool.io/ai-engineering/posts/embeddings-and-vector-similarity/How text gets turned into numbers that capture meaning, and why ‘similar meaning = nearby numbers’ is the foundation of search, recommendations, and RAG.https://dataandaischool.io/ai-engineering/posts/prompting-fundamentals/Tue, 04 Aug 2026 00:00:00 +0000https://dataandaischool.io/ai-engineering/posts/prompting-fundamentals/Why specificity beats cleverness, and how to talk to a model that takes everything you say literally.https://dataandaischool.io/ai-engineering/posts/tokens-and-context-windows/Mon, 03 Aug 2026 00:00:00 +0000https://dataandaischool.io/ai-engineering/posts/tokens-and-context-windows/What a token actually is, why every model has a memory limit, and why this quietly affects cost, speed, and what you can even ask a model to do.https://dataandaischool.io/ai-engineering/posts/how-llms-actually-work/Sun, 02 Aug 2026 00:00:00 +0000https://dataandaischool.io/ai-engineering/posts/how-llms-actually-work/No math-heavy transformer internals, just the core idea: an LLM is a very sophisticated autocomplete engine trained on huge amounts of text.https://dataandaischool.io/data-engineering/posts/what-is-data-engineering/Sat, 01 Aug 2026 00:00:00 +0000https://dataandaischool.io/data-engineering/posts/what-is-data-engineering/A beginner-friendly explanation of what data engineers actually do, why the role exists, and how it's different from data analysts and data scientists.https://dataandaischool.io/posts/what-is-data-engineering/Sat, 01 Aug 2026 00:00:00 +0000https://dataandaischool.io/posts/what-is-data-engineering/A beginner-friendly explanation of what data engineers actually do, why the role exists, and how it's different from data analysts and data scientists.https://dataandaischool.io/ai-engineering/posts/what-is-generative-ai/Sat, 01 Aug 2026 00:00:00 +0000https://dataandaischool.io/ai-engineering/posts/what-is-generative-ai/The simple difference between predictive AI and generative AI, explained without the jargon.